Video Failure
The first thing to check in cases of complete video failure is the power
status, as detailed above. If you can always hear your laptop fan when you
turn on the laptop and now you can't it's not a video failure, it's a power
or mainboard failure. The next troubleshooting step is to connect an external
monitor with a standard VGA connector, whether a CRT or an LCD. If your notebook
won't light up the external monitor, it's extremely likely that either the
motherboard or the internal video adapter (if it's not part of the mainboard)
has failed. If the video adapter is a discrete component and you can find
a replacement for under $100, it might be worth gambling on replacing, but
it's almost never cost effective to replace a mainboard. There is a small
chance that the internal connection to the external video port has coincidentally
failed with the laptop's own video subsystem, but it's not all that likely.

Hi,
The cables between the LCD and the Motherboard are most likley loose or then there is a problem with the backlight, do you have picture but just no backlight? if you have the screen under a light when the backlight is off do you have picture? if you do then the problem is in the backlight, or its connectors.

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Please try the following:1.remove the power cable an plug it again2.check is the power it's on at the back of the source.3.if you hear some noises write them down and search for the error codes on the net.

There could be many reasons for this. Open the case and make sure the components are plugged in tightly. Make sure the CPU Fan is spinning and is dust free.Reseat the RAM modules, make sure to clean the RAM slots before reseating the modules. If all this fails to give results, but a new power supply and try that, you do not have to install the power supply but can keep it outside and test it. If the MB is gone, then, look to see if she still has warranty, if not ebay may be a cheap answer for the same MB.

On the back of the power supply there is a 120/220 V AC selector switch.
It's possible that switch got knock on the wrong voltage position.

Pull the power cable.
Move the switch back and forth between the two position.
Make sure you leave the switch in the correct selection.
120v = USA
If you have time,open the case and inspect the RAM module(s) and card(s). They can be un-sitted.
plug in power cord and power on the pc.

If the beeping is coming from the power supply, that typically means that you are pulling too much wattage. I would recommend trying a higher wattage power supply. The video card is one of the lowest things on the computer's list of things to keep running at all costs, because even if your video card flickers off, you won't lose data. Before getting another new power supply though, I would ensure that your video cables are properly plugged into your video card and your monitor. To be sure that they are snug simply screw them in so that they don't wiggle at all when you pull on them.